Improvement in bench-planes



geiten gisten glstwt @fitta BENJAMIN A. BLAN DIN OF GHARLESTOWN, MASSACHUSETTS. Letters Patent No. 64,477, dated lll'ag 7, 1867.

IMPROVEMENT IN BENCH-PLANES.

@te dgrhult nicht in in tigen tttertnteut mit uniting gint nf ilgtitzme.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, BENJAMIN A. BLANDIN, of Charlestown, in the county of Middlesex, and State of Massachusetts, have invented an Improvement in Bench-Planes; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sufficient to enable those skilled in the art to practise it. i

The invention relates to the manner of securing and supporting a plane-iron in position, with reference to provision for adjusting the angle of the bit or eutter-iron or its extent ot' cutting action. In certain benchplanes now in the market, having provision for clamping the iron in the stock by means of a clamp-lever, (as is shown, for instance, in United States Patents Nos. 20,615 and 21,31I,) the iron is supported on a movable or rocking bed-piece pivoted to the stock at some distance above the mouth of the cutter, said bed-piece having a horizontal arm extending rearwards from it, through which arm a stationary vertical screw passes,A upon which a nut works, so that when' the cutter is clamped in position by the clamp-lever, the position or angle of the cutting edge of the bit may be adjusted to regulate the cut ot' the bit or the protrusion of the cutting edge from the face of the plane. The construction embraced in such tipping-bed, and in its connection with the planc-- stock, is expensive, and the hed itself, -not being supported below the pivots, trcmbles, and causes the cutting edge to chatter when the plane is being used. To cheapen the construction, and to so apply the bed that it is at all times supported directly above or adjacent to the mouth, are the objects of my invention, which invention consists in applying, in combination with the device by which the iron is clamped in the stock, a tipping or rocking' bed-piece, the lower end of which is made convex on its under surface, such convexity resting in a cylindrical or concave depression or socket-seat in the stock,l and the upper surface (at such lower end) having a plane face upon which the iron or .cutter is supported, the rear end of the cutter straddling a screw, upon which the adjusting nut works, so that by screwing down said nut such rear end is depressed, tipping the lower end in its seat or socket, so as to diminish and regulate the angle and bite oil' the cutting edge of the iron.

The drawing represents a central section of a bench-plane embodyingl the invention. a denotes the stock; I), the plane-iron or cutter; c, the cap; d, the clamp-lever. 'The cutter at the mouth e, and when introduced into the stock, rests on the incline f, and at the upper side of the throat of the stock on stops orways g, (one on each side.) The clamp-lever slides under fulcrum-stops h, (one on each side,) its lower end bearing upon the cap, and so that by the action of a screw, z', or other suitable device, the cutter is clamped in the stock7 as will be readily understood. Just in rear of the mouth e, a convex socket or depression, 7c, is formed in the stock, this socket serving as aseat for a rocking bed-piece, l, ,the front face m of which, when the cutter is introduced, is in the plane of the facef, against which the lower end of the cutter rests. The bed Zhas ein arm, n, extending back from it, through a bifurcation, o, of which a stationary serewgp, extends, as seen in the drawings. A nut, g, works on this screw and against the arm n. When the cutter is introduced into the stock, this nut is turned back, so that the bed may be tipped in its socket to bring its face and the facef into line, in which condition the cutting edge is protruded from the pla-ne face for the maximum of cut desirable, and in this position the cutter is securely clamped. ,If now the nut g be turned down on its screw, it will bear upon the arm n, tipping or rolling the bed in its socket, and forcing the lower edge of the face m forwards, pressing up the cutting edge of the bit and lessening the cut, through all of which movement to the forcing'of said edge in beyond thc face of the plane, the part ot`the bed opposite to the bearing surface of the cutter thereupon is directly supported by the seat or socket k, such iirm support being Aincapable of vibratory movement in itself, and preventing any vibrating or chattering movement in the cutter. The piece lis a simple casting, dropped into position when the cutter is to be introduced, requiring no fitting, and being very inexpensive, thereby rendering the construction embodying such means of adjustment very cheap, as well as very efficient and reliable. I claim combining, with a mechanism for clamping a plane-iron in position, the rocking bed-piece Z, supported and rolling in a concave scat, le, and serving to support and adjust the cutting edge of the plane-iron, substantin-ily as set forth` BENJN. A. BLANDIN.

Witnesses:

J. B. Cuosnr, F. GoULD. 

